Steel plate having excellent wear resistance and composite corrosion resistance and method for manufacturing same

Abstract

The present invention provides a steel sheet having excellent wear resistance and composite corrosion resistance, and a method for manufacturing same.A corrosion-resistant steel sheet according to an embodiment of the present invention comprises, in wt %: 0.04 to 0.10% of carbon (C); 0.1% or less (excluding 0%) of silicon (Si); 0.20 to 0.35% of copper (Cu); 0.1% to 0.2% of nickel (Ni); 0.05 to 0.15% of antimony (Sb); 0.07 to 0.22% of tin (Sn); 0.05 to 0.15% of titanium (Ti); 0.01% or less (excluding 0%) of sulfur (S); 0.005% or less (excluding 0%) of nitrogen (N); the remainder iron (Fe); and unavoidable impurities, and satisfies formulas 1 and 2 below:[Ni]/[Cu]≥0.5  [Formula 1]48×([Ti]/48−[S]/32−[N]/14)≥0.04  [Formula 2]wherein, in formulas 1 and 2, [Ni], [Cu], [Ti], [S], and [N] represent contents (wt %) of Ni, Cu, Ti, S, and N contained in the steel sheet, respectively.

1 . A corrosion-resistant steel sheet comprising, by weight: 0.04 to 0.10% of carbon (C), 0.1% or less (excluding 0%) of silicon (Si), 0.20 to 0.35% of copper (Cu), 0.1 to 0.2% of nickel (Ni), 0.05 to 0.15% of antimony (Sb), 0.05 to 0.15% of titanium (Ti), 0.07 to 0.22% of tin (Sn), 0.01% or less (excluding 0%) of sulfur (S), and 0.005% or less (excluding 0%) of nitrogen (N), with a remainder of iron (Fe) and unavoidable impurities,
 the corrosion-resistant steel sheet satisfying the following Formulae 1 and 2:
   [Ni]/[Cu]≥0.5  [Formula 1]
 
   48×([Ti]/48−[S]/32−[N]/14)≥0.04  [Formula 2]
 
   wherein [Ni], [Cu], [Ti], [S], and [N] represent contents (wt %) of Ni, Cu, Ti, S, and N in the steel sheet, respectively.   
     
     
         2 . The corrosion-resistant steel sheet of  claim 1 , wherein:
 the corrosion-resistant steel sheet includes a TiC precipitate, and   the TiC precipitate and an aggregate formed of the TiC precipitate are included at 10 16  or more per 1 cm 3 .   
     
     
         3 . The corrosion-resistant steel sheet of  claim 2 , wherein:
 the TiC precipitate has a particle diameter of 1 to 10 nm.   
     
     
         4 . The corrosion-resistant steel sheet of  claim 1 , wherein:
 the corrosion-resistant steel sheet satisfies the following Formula 3.
   12×[Sn]+22×[Sb]+50×[Cu]≥15  [Formula 3]
 
   wherein [Sn], [Sb], and [Cu] represent contents (wt %) of Sn, Sb, and Cu in the steel sheet, respectively.   
     
     
         5 . The corrosion-resistant steel sheet of  claim 2 , wherein:
 when the steel sheet is immersed in a mixed solution of 28.5 wt % of a sulfuric acid solution and 0.5 wt % of a hydrochloric acid solution at 40 to 80° C., a concentrated layer is produced on a surface of the steel sheet.   
     
     
         6 . The corrosion-resistant steel sheet of  claim 2 , wherein:
 when the steel sheet is immersed in 50 wt % of a sulfuric acid solution at 50 to 90° C., a concentrated layer is produced on a surface of the steel sheet.   
     
     
         7 . The corrosion-resistant steel sheet of  claim 5 , wherein:
 the concentrated layer includes Cu, Sb, and Sn.   
     
     
         8 . The corrosion-resistant steel sheet of  claim 7 , wherein:
 the concentrated layer has a concentrated amount of 15 wt % or more,   wherein the concentrated amount refers to a sum of the contents (wt %) of concentrating elements Mo, Cu, Sb, and Sn, at a boundary point at which wt % of Fe and O are the same.   
     
     
         9 . The corrosion-resistant steel sheet of  claim 5 , wherein:
 the concentrated layer has a thickness of 10 nm or more.   
     
     
         10 . The corrosion-resistant steel sheet of  claim 1 , wherein:
 a recrystallization fraction after subjecting the steel sheet to an annealing heat treatment is 80% or more.   
     
     
         11 . The corrosion-resistant steel sheet of  claim 5 , wherein:
 when the steel sheet is immersed in the mixed solution of 28.5 wt % of the sulfuric acid solution and 0.5 wt % of the hydrochloric acid solution at 60° C. for 6 hours, a corrosion weight loss ratio is 1.0 mg/cm 2 /hr or less.   
     
     
         12 . The corrosion-resistant steel sheet of  claim 6 , wherein:
 when the steel sheet is immersed in 50 wt % of the sulfuric acid solution at 70° C. for 6 hours, a corrosion weight loss ratio is 25 mg/cm 2 /hr or less.   
     
     
         13 . The corrosion-resistant steel sheet of  claim 2 , wherein:
 when the steel sheet is a hot rolled steel sheet, the hot rolled steel sheet has a tensile strength of 550 MPa or more and a surface hardness of 85 or more based on HRB.   
     
     
         14 . The corrosion-resistant steel sheet of  claim 2 , wherein:
 when the steel sheet is a cold rolled steel sheet, the cold rolled steel sheet has a tensile strength of 500 MPa or more and a surface hardness of 80 or more based on HRB.   
     
     
         15 . A method for manufacturing a corrosion-resistant steel sheet, the method comprising: preparing a steel slab which includes, by weight: 0.04 to 0.10% of carbon (C), 0.1% or less (excluding 0%) of silicon (Si), 0.20 to 0.35% of copper (Cu), 0.1 to 0.2% of nickel (Ni), 0.05 to 0.15% of antimony (Sb), 0.07 to 0.22% of tin (Sn), 0.05 to 0.15% of titanium (Ti), 0.01% or less (excluding 0%) of sulfur (S), and 0.005% or less (excluding 0%) of nitrogen (N), with a remainder of iron (Fe) and unavoidable impurities, and
 satisfies the following Formulae 1 and 2;   heating the slab at 1,200° C. or higher; and   hot rolling the heated slab at a finish rolling temperature of 850 to 1000° C. to manufacture a hot rolled steel sheet.
   [Ni]/[Cu]≥0.5  [Formula 1]
 
   48×([Ti]/48−[S]/32−[N]/14)≥0.04  [Formula 2]
 
   wherein [Ni], [Cu], [Ti], [S], and [N] represent contents (wt %) of Ni, Cu, Ti, S, and N in the steel sheet, respectively.   
     
     
         16 . The method for manufacturing a corrosion-resistant steel sheet of  claim 15 , further comprising:
 after the manufacturing of a hot rolled steel sheet,   winding the hot rolled steel sheet at 450 to 750° C.;   cold rolling the wound hot rolled steel sheet at a reduction ratio of 54 to 70% to manufacture a cold rolled steel sheet; and   subjecting the cold rolled steel sheet to an annealing heat treatment at 750 to 880° C.   
     
     
         17 . The method for manufacturing a corrosion-resistant steel sheet of  claim 15 , wherein:
 in the heating of a slab at 1,200° C. or higher,   a residence time is 150 minutes or more.